hyperstart travis-ci libvirt has something wrong with launch domain

[teawater]

https://travis-ci.org/hyperhq/hyperstart/builds/459648651
https://travis-ci.org/hyperhq/hyperstart/builds/459640064

Both of them got:
I1126 09:00:35.252712 22518 libvirt.go:645] domainXML: vm-RZGreCzcOF128327688hvm/var/lib/hyper/kernel/var/lib/hyper/hyper-initrd.imgconsole=ttyS0 panic=1 no_timer_check iommu=off clocksource=acpi_pm notsccore2duo<on_poweroff>destroy</on_poweroff><on_reboot>destroy</on_reboot><on_crash>destroy</on_crash>/usr/bin/qemu-system-x86_64

qemu:commandline</qemu:commandline>
E1126 09:00:35.475466 22518 libvirt.go:653] Fail to launch domain [Code-1] [Domain-10] internal error: process exited while connecting to monitor: qemu-system-x86_64: CPU feature ssbd not found
I1126 09:00:35.475556 22518 vm.go:788] VM[vm-RZGreCzcOF] GetVm succeeded

But hyperd doesn't set CPU feature ssbd.